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Select blocks by attribute TAG

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Hello...I find a lot of solution for select blocks by an attribute values, but I did not find any solution for select all blocks in a file that have an attributes with the same tag.
For example I want to select all the blocks that have the attribute tag "SIGLA"...I did not find a way by using normal autocad procedures or commands...
Regards

thank you all! tomorrow I'll try them all...
In the meantime, looking with google, I found other possible solutions...I read what "Information for new members" says about link so, for completeness, I'll pass you the link and it will be ok you'll read what i have found.
I write to you as soon as possible!

Hello to everyone! I tried the various lisp and these are my conclusions...I apologize if they are inaccurate but it was a full week, I did not have time and I report the "immediate result"...:
1) the Grrr's lisp stopped after the pick of the attribute (I'll try it again)...but I like the idea of select by click an attribute!
2) the ronjob's lisp is ok and I like that it works by a selection area
3) selbytag is ok and it works also with frozen layer that it is very useful for me...at the moment I prefer this lisp.
Maybe to exercise I'll try to write a lisp that includes all three...

the next step is it to extrapolate the values contained in the chosen attribute for count them!
I tried the express command attext but it generates useless txt file...I will try to find some method that generate file .csv (I hope it exists).

I love Lee Mac lisp like Count Attributes Value or Block Counter because they organize the data in tables or csv files, but I need to work only with the values of the tag attribute I choose for the selection.